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At least 217 records · Page 12Linked to original sources
PubMed1996

Variation in hematological and serum biochemical values of the mountain brushtail possum, Trichosurus caninus Ogilby (Marsupialia: Phalangeridae).

Hematological and serum biochemical values were determined in a wild population of the mountain brushtail possum (Trichosurus caninus) at Cambarville, central Victoria, southeastern Australia. Animals were sampled during two-week trapping periods in June, September, and December 1992, and April 1993. Values for hemoglobin, red cell count and hematocrit were significantly higher in males than females. Total protein and mean corpuscular volume (MCV) were significantly higher in female T. caninus. Significant seasonal variations were detected for total bilirubin, alkaline phosphatase, total protein, albumin, urea, absolute eosinophils, MCV, sodium, potassium, and phosphate.

Alkaline Phosphatase↗
PubMed1991

[The hypophysis of Monodelphis domestica (Marsupialia): the state of organ development and cell differentiation in the adenohypophysis on different days post partum].

In the newborn gray short-tailed opossum, Monodelphis domestica, the fusion of the neurohypophysis and adenohypophysis has not finished. A compression of the adenohypophyseal vesicle is exerted by the neurohypophysis. The latter, as can be seen in a 12-day old specimen, finally, will be almost completely wrapped into the adenohypophysis. The adenohypophysis of the newborn and early pouch-young shows substantial growing on the basis of mitoses mainly in the pars intermedia, but in the pars distalis, too. Cytodifferentiation in the newborn, light microscopically, is indicated by an increasing heterogeneity of cell morphology which is most obvious in the cranial and caudal regions of the median sections. Electron microscopically, the presence of small quantities of granules as well as small quantities of golgi membranes and ribosomal endoplasmic reticulum, respectively, gives evidence of a beginning synthesis activity in the newborn.

Animals↗
PubMed1990

[The topography of the abdominal organs of Monodelphis domestica (Marsupialia)].

30 adult animals (14 females, 16 males) were studied macroscopically. The main findings are as follows: 1. The intestine is without striking macroscopic features that characterize the different parts of it. A variation of position of ileum, cecum, and colon, respectively, is due to the length of their mesenteries. 2. In adult males, the intestines are displaced from their position in the caudal part of the abdomen by the urethra (the urethral diameter is even wider than that of the gut, because the wall contains masses of prostatic glandular tissue). 3. The liver is clearly divided into lobes, however, there is no notch between the quadrate lobe and the left medial lobe. The falciform ligament is regarded as the border-line between these lobes, while the gall bladder separates the quadrate lobe from the right medial lobe. 4. The spleen lies almost entirely caudal to the costal arch. It extends dorsally between the stomach and the left kidney. Along the body wall, it reaches the ventral median line and shows even a slight orientation towards the xiphoid cartilage. 5. The greater omentum may extend to the cranial end to the urinary bladder. It is extremely thin and therefore hardly visible. 6. In females, subperitoneal fat may extend from the caudo-dorsal body wall along the lateral walls down to ventral regions, in some cases even occupying a considerable part of the caudo-ventral abdomen.

Animals↗
PubMed1987

[The angular process of Monodelphis domestica (Didelphidae, Marsupialia) and its relation to the middle ear: an ontogenetic and evolutionary morphologic study].

In most marsupials, the angular process is inflected medially. By using an ontogenetic series of Monodelphis domestica, the development of this characteristic structure has been described. In contrast with the eutherian mammals, in marsupials there is retained a close connection between the dentale and the tympanicum and goniale; it is well known that these 2 elements of the middle ear are derived from the angulare and prearticulare of the reptilian lower jaw. At the neonatal stage, the dentale and tympanicum are both relatively vertically orientated; during the following 2 weeks, they take an increasingly oblique position, which is primarily caused by the rapid growth of the braincase. Only after the eruption of the first teeth, the ascending ramus of the dentale takes a more and more vertical position, whereas the angular process remains with its tip near the medioventral floor of the tympanic bulla. The bulla shows at this place a rectangular fenestra which is covered by a membrane of loose connective tissue; the tip of the angular process, which is always free of muscular insertions, maintains contacts with this fenestra throughout life. During juvenile and adult life stages, the process becomes somewhat removed from the fenestra for obvious reasons, but at a gape of about 40 to 50 degrees it inevitably must touch the "inferior tympanic membrane" and possibly also the tympanic ring. It is speculated that the relationship between the angular process and the tympanic bulla represents a specific form-function complex for sound transmission, which may be a modified retention from archaic mammalian conditions. Further details of the ontogenetic development of the tympanic region have been described which may be of some relevance for the evolutionary morphology of mammals: The tympanic process of the petrosal, which fixes the posterior end of the tympanic ring, is formed by 'Zuwachsknochen' (additional bone) but not by cartilage. The styloid process remains cartilaginous throughout life: its free tip ends in the lateral wall of the tympanic cavity and it is closely connected with the collum mallei and the posterior end of the tympanicum; it guides the chorda tympani and may therefore be homologous with the cartilage of Spence. The cartilage of Paauw is interpreted in terms of functional morphology. A model of evolutionary transformation of the dentale-tympanicum complex in mesozoic mammals in outlined on the basis of the ontogenetic findings in Monodelphis and other didelphid and dasyurid marsupials.

Aging↗